Manufacturing method of tennis balls.

It manufactures a ball without compression assembly tennis shaping the core halves are glued together and applying two pieces of felt 4 of this core. The felt pieces 4 are pressed against the core by a preliminary pressing step followed by a step of main press. When the main pressing step, a drum 85 receives a rotational and axial movement relative to an outer pressing member 86. This pressing member 86 is situated at a distance from the drum 85 and this interval is adjustable to varying the pressing force.